Resetting mechanism for gasoline dispensing pumps



,May 6, 1952 R. H. HILL ET AL 2,595,259

RESETTING MECHANISM FOR GASOLINE DISPENSING PUMPS Filed Feb. 28, 1947 7Sheets-Sheet 1 INVENTORS y 6, 1952 R. H. HILL ET AL 2,595,259

RESETTING MECHANISM FOR GASOLINE DISPENSING PUMPS Filed Feb. 28, 1947 7Sheets-Sheet 2 Q 5 & S

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m 3 M? i l 3 NJ s m =1 g Q 3 S i w WL- a m lllllll u N j: 1 a g Q v \r 1INVENTORS m k g 4 Wm ,fli lw gm y 6, 1952 R. H. HILL ET AL 2,595,259

RESETTING MECHANISM FOR GASOLINE DISPENSING PUMPS y 1952 R. H. HlLL ETAL 2,595,259

RESETTING MECHANISM FOR GASOLINE DISPENSING PUMPS Filed Feb. 28, 1947 7Sheets-Sheet 4 May 6, 1952 2,595,259

RESETTING MECHANISM FOR GASOLINE DISPENSING PUMPS Filed Feb. 28, 1947 R.H. HILL ETAL '7 Sheets-Sheet 5 INVENTORS @erffl. Jardeie z/g May 6, 1952R. H. HILL ET AL ,595,

RESETTING MECHANISM FOR GASOLINE DISPENSING PUMPS Filed Feb. 28, 1947 7Sheets-Sheet e INVENTORS May 6, 1952 2,595,259

RESEITTING MECHANISM FOR GASOLINE DISPENSING PUMPS Filed Feb. 28, 1947R. H. HlLL ET AL 7 Sheets-Sheet 7 J7 3w 3J0 L 2 247 656 ZZZ /ZZ w QXMMPatented May 6, 1952 RESETTIN G MECHANISM FOR GASOLINE DISPENSING PUMPSRobert H. Hill and Burdette W.

Ind., Company, Indiana assignors to Tokheim Oil Foss, Fort Wayne, Tankand Pump Fort Wayne, Ind., a corporation of Application February 28,1947, Serial No. 731,636

28 Claims. l This invention relates to reset mechanisms for resettingthe computer head of a so-called computing device and more particularlyto a gasoline pump of the computer type.

Among the objects of the present invention is to provide an hydraulicmechanism operated by the pressure in the dispensing line forautomatically actuating the reset mechanism prior to the initiation ofthe dispensing operation and operable from the pressure of the pumpwhich causes the dispensing flow and whereby the hydraulic pressure'maybe utilized to control the speed of the resetting mechanism whereby toavoid injury to such mechanism.

Yet another object of the invention is to provide an hydraulic mechanismfor resetting the computer mechanism wherein means is provided wherebyto prevent a false registration of the computer mechanism.

Yet another object of the invention resides in providing hydraulic resetmechanism for the computer head including means which will permit thepump motor switch lever being thrown to a position to stop the pump butwhich will prevent the switch from being thrown again to a second onposition until the reset mechanism has been restored to an originalinitial position from which resetting starts, thereby precluding falseregistration of the numeral wheels.

Yet another object of the invention resides in providing mechanismassociated with the switch for the pump motor constructed and arrangedso that if the pump motor switch is once thrown to the pump ofiposition, the reset mechanism must complete its cycle of operationsbefore such pump motor switch can again be turned to a pump on position.

Yet another object of the invention resides in providing, in anhydraulic reset mechanism for a computer head, means for preventingpartial actuation of the shutter mechanism or of the reset mechanism dueto momentary failure of the power line'or due to the momentary passageof relatively large volumes of air through the air separator such aswould cause such a material reduction of pressure in the dispensing lineto affect the hydraulic reset mechanism.

Yet another object of the invention resides in providing meanscontrolled by the on position of the motor pump switch lever forprecluding movement of the hydraulic reset mechanism away fromdispensing position due to the momentary passage of air through the airseparator or the momentary failure of the electrical system.

Yetanother object of the present invention resides in providing anhydraulic reset mechanism for a gasoline computer pump possessing all ofthe advantages of the foregoing.

Another object of the invention is to provide a resetting device whichwill reset the computer at a fixed constant speed.

Another object of the invention resides in providing a resetting devicewhich will prevent the operation of the resetting mechanism during anydischarge of liquid from the dispensing nozzle.

These and other objects of the invention will be apparent from a perusalof the following specification when taken in connection with theaccompanying drawings, wherein:

Figure 1 is a view of a gasoline computer pump provided with the instantinvention;

Figure 2 is a schematic view of the flow lines of the pump andincorporating parts of the present invention;

Figure 3 is a diagrammatic representation of the hydraulic resetmechanism which includes the air separator or air release mechanism ofthe Bechtold Patent 1,868,444, issued July 19, 1932, the details of thevalve mechanismbeing more specifically shown in Figure 6 of thedrawings;

Figure 4 represents the same diagrammatic view showing the motor pumpswitch lever thrown to the on position, the resetting operation havingtaken place and dispensing in operation;

Figure 5 is a corresponding view of the parts showing the hydraulicreset mechanism returning to normal position and the motor pump switchlever in off position;

Figure 6 is a detail view of the valve construction showing the airrelease mechanism of the aforesaid Bechtold patent, and also shown inthe Foss Patent 2,289,003, issued July 7, 1942 Figure '7 is a view ofthe torque responsive clutch showing the position of parts before thepump is started;

Figure 8 is a view of the same showing the position of the parts afterthe pump is started and the reset shaft turned one and one eighth of arevolution;

a Figure 9 is a view showing the position of the parts an instant afterthe completion of one and one eighth revolution;

Figure 10 is a view showing the position of the parts an instant afterthe cam is released; I

Figure 11 is a sectional view of the torque responsive clutch takenonthe line II--l of Figure 7;

Figure 12 is anexploded view showing the various parts of the torqueresponsive clutch;

Figure 13 is a view, similar to Figure 4, but

incorporating additional safety structures for insuring proper operationof the parts;

Figure 14 shows a view of a modified or commercial form of the hydraulicreset mechanism;

Figure is an enlarged view of the hydraulic cylinder and its piston andrack and the reset latching mechanism;

Figure 16 is a section on the line 15-45 of Figure 14 showing thedetails of construction of the improved clutch; and

Figure 1? is a section on line l'i-il of Figure 16.

In the present commercial type of gasoline computer pump t he computermechanism, which is of the well known Veeder-Root type, requires amanual one and one eighth forward turn to complete the resettingoperation. This forward turn is followed by a one eighth turn in thereverse direction for the purpose of raising the shutters which mask thenumeral wheels during the resetting operation. The one eighth reverseturn for clearing the shutters from the numeral wheels is actuated byspring means in the computer itself andv this reverse turn occurs at thetermination of the forward one and one eighth turn andis occasioned bythe computing mechanism coming against a positive stop, which is thenfol'lowedby the aforesaid reverse turn. One or all of the followingpatents owned by Veeder- Root, Incorporated, of Hartford, Connecticut,discloses the particular type of mechanism herein set forth: Slye2,264,557, of December 2, 1941; Wild 2,274,115, of February 24, 1942;Slye 2,282,- 678, of May 1 2, 1942. In addition, it is to be noted thatthis type of Veeder-Root computing mechanism has been in commercial useand sale in practically all of the computer type pumps now in use in theUnited States. They are made by Veeder-Root,Incorporated, of Hartford,Connecticut, and are known as computer pumps, and the computingmechanism is constructed and opcrates in accordance with the disclosureof this application. Furthermore they are described in repair partmanuals of Veeder-Root, Incorporated and also of many of the gasolinepump manufacturers, including The Wayne Pump Company, S;. F. Bowser &Company, Incorporated, The TokheimOil Tank and Pump Company, ofFortWayne, Indiana, the Erie Company, of Erie, Pennsylvania, and manyothers too numerous to mention. In short, the construction and operationof this type of computer is well known to those skilled in the art.

Referring now to the drawingsin detail, in Figure 1 there isshown a moreor less conventional type oidispensing pump preferably of the computertype which is adapted not only to compute the volume but also the price.The invention is. equally adaptable to any type of volume and/or priceindicating pump wherein indicating or registering mechanism issynchronically operated in accordance with the liquid flow through themetering. or liquid. measuring mechanism. In the present instance, thecomputing mechanism is shown as positively driven by the meter shaft,but other adaptations. are within the contemplation of this invention.

Referring now to Figure 1, the invention shows the usual type of angleiron frame or skeleton upright .I whichsupports the conventional type ofhousing 2- and within which housing is positioned the other internalunitsof the pump such as the electric motor 3 driving the pump 4 throughsuitable gearing such as the belt 5. The pump 4 is adapted'todrawgasolinefroma supply tank,

upwardly through the pipe 5 forming a part of the dispensing line, intothe suction chamber 1 and an air separator or air release mechanismshown particularly in Figure 3. In the present instance, the airseparator is of the type preferably as shown in a patent to Bechtold,No. 1,868,- 444, patented July 19, 1932, comprising a housing or othercasing having internal partitions. The pump has an inlet chamber orsuction chamber 1 connected with the pipe 6 and connecting with apreferably cylindrical screen 8 through which the entering gasolineflows on its way to the pump 4. The pump is shown preferably asininternal gear type but any type of pump may be utilized. The gasoline isdischarged from the port If! into a separation chamber H which isadapted to separate air and/or vapor from the gasoline, discharging theair and/or vapor to atmosphere while passing the gasoline to and throughthe dispensing line. In the air separator any air entering the chamber Hwill necessarily rise to the top and pass through the small orifice [2into the superior float chamber [3. If no air be present, a small amountof gasoline will pass through this orifice l2 when the pump is running,

' but if or when the amount of gasoline. in the chamber l3 rises to sucha level as to raise the, float I4, this in turn, opens the valvev 15.This additional flow of liquid is thus returned to the suction side ofthe pump 4 by means of the conduit l6. The float chamber I3 ispreferably covered by a metal dome I"! to which in the present inventionare connected two tubes l8 and I9. Tube l9 serves as a constantly openvent to the atmosphere. This tube passes upwardly and out through thehousing 2, as shown in Figure 1. Thus the float chamber I3 is alwaysunder normal atmospheric pressure.

Tube I8, which is not disclosed in the prior Bechtold patent, leads tothe upper end of; acylinder 26 hereinafter more fully described indetail.

As in accordance with the prior Bechtold patent, and as shown indetailin Figurefi of the present drawings, the separation chamber II' ispr vided with two pressure operated valves 21. and 22 normally heldclosed by springs 23 and 24 respectively. Valve 22 is known as theby-pass valve, while valve 2| is a, regulating valve. I the dividingpartition25 which divides the pressure chamber from. the float chamber,there are provided two openings. adapted to receive. cylinders 26. Theupper ends of these cylindershave, an annular flange 2'! which fits intoa counterbore in the casting. On top of these, flanges are covers 28which are clamped thereon by the, bar 29 and screws 30. In the center ofthese cylinder covers 28 is a dome-like portion 31 apertured centrallyas at 32. The bar clamp 29 is provided with holes 33 which register withthe vent holes 32 whereby to allow the. upper ends of these cylinders,26 to bev open to atmospheric. pressure. through the gasoline, inthefloatchamber'lirand the atmospheric-vent tube [9. Withineachcyh inder 28is a piston 34 securedto valve'rods. 3.5. and. 36.

for holding the valves closed until sumcient pres-- sure is created inthe separation chamber H by the pump whereby to-act upon thepistons'flOn the. lower-ends of the-cylinders 2B, are spring retainer disks 3!having; a, large,

and open the valves against their springs. Below the valve 22 is aby-pass duct 38 which opens into'the suction chamber 1. Below the valve2| is a duct 39 the top of which is attached to a pipe 40 constituting apart of the dispensing line and leading in the inlet side of the meter4I. Attached to the side of the separator chamber H is another tube 42the other end of which is attached to the bottom of the cylinder 20 ofthe resetting device.

From the outlet side of the meter, the dispensing line 43 flows througha liquid flow gauge 45 and from thence the gasoline passes through theusual type of flexible hose 46 mounted on the outside of the housing orcasing 2. This hose 46 is provided with the conventional type of nozzlevalve 4'3. The meter 4| drives the computer 49 by means of the driveshaft coupling 56. The computer may be of the conventional type usedtoday or may be just a simple type of counter. For this discussion, themechanism is devised for resettin the type of computer generally knownas a Veeder-Root, manufactured by Veeder-Root, Incorporated of Hartford,Connecticut. On this type of computer the reset shaft 5| does not rotatewhen the computer is being driven. To reset, the shaft must be turned405 degrees counterclockwise, looking at the computer from the hoseside, as viewed in Figure 3, and it will then rock back 45 degrees.

By reference to Figures 1, 2 and 3, the cylinder 28 shown in Figure 3 issuitably mounted on the support frame I of the pump. This cylinder 20 isprovided at its upper end with a relatively long bearing 52 in whichrotates a pinion shaft 1'.

54. The opposite wall of the cylinder 26 is provided with an elongatedsleeve-like portion 56 for purposes hereinafter recited, and the top ofthe cylinder 26 is provided with a longitudinal housing or guideway 58to accommodate the uppermost position of a rack about to be described.

The pinion shaft 54 is provided on its inner end with a pinion 66adapted to mesh with an elongated rack 62 normally disposed within thecylinder and carryin at its lower end a piston 66. A coil spring 68normally confined between the upper end of the cylinder 20 and the topside of the piston 66 normally serves to force the piston down to theposition shown in Figure 3. The interior of the cylinder 20 is providedwith a guideway 18 to the rack. The top 72 of the rack, as shown moreclearly in Figure 5, is provided with a bevelled surface 14 forcooperation with a preferably round nose 16 of a plunger 78 which has acollar 88 confining a spring 82 between it and the shoulder 84 of thebearing sleeve-like portion 56 whereby the plunger I8 is normallypressed toward the rack to maintain the rounded nose portion I6 incontact with the rack. The hollowed outer end 86 of the plunger i8 isprovided with a second plunger the stem 88 of which is normallyprojected outwardly by means of a second coil spring 90. A threadedthimble 92 closes the end of the plunger 18 about the shank 88. Theinner end of the shank is provided with a head which is adapted tocompress the spring 98 in the bored portion of the plunger 18. The outerend of the shank 88 is provided with a preferably squared end forming a,latch to cooperate with a shoulder portion 94 on the inner rounded end96 of the switch lever 88 which is pivoted at I80. The upper end of thisswitch lever may be formed preferably in any well known manner toreceive thereon the hose nozzle which is of customary construction. Theusual port associated with the switch lever, as is well known in theart. The hose nozzle 41, it will be understood, is provided with thecustomary valve 4Ia and the valve actuating member 47b.

Associated with the liquid dispensing line 43 coming from the meter 4|is a fitting which connects as at 97 with that port of the dispensingline 43 into which the meter 4| discharges. This fitting has a lowerportion providing a bear- 7 ing Isl with a valve seat I62 and an outletpipe I84 which connects with that portion of the dispensing line 43 thatis beyond the usual type of sight glass 45. In addition the fitting isprovided with a delivery valve I06 adapted to be urged onto the valveseat I82 by a coil spring I88. The valve I66 has a stem III] whichslides in an aperture in the bearing IOI. The hearing is shown as beingat the upper portion of the elongated guideway 58 in which the rack 62reciprocates. I66 is in the dispensing line and is normally closed onthe valve seat I02.

A torque responsive clutch mechanism H2 is located between the pinionshaft 54 and the computer reset shaft 5I, as shown clearly in Figure 3,and its function is to provide a driving agency between thehydraulically actuated pinion shaft 54 and the reset shaft 5| of thecomputer. The present type of computer which rotates 405 degreesforwardly to reset the numeral wheels of 'the computer and then 45degrees rearwardly to remove the shutters from the reset numerals,requires a type of clutch which will permit this. In addition, theclutch must be constructed and arranged to permit the rack 62 of thehydraulically actuated mechanism which gears with the pinion 68 to movedownwardly its full length stroke after the upward full length stroke ofthe rack which is the actual reset portion of the movement of the rack.The downward stroke of the movement of the rack is a cocking orconditioning movement of the piston so as to put the reset mechanism incondition for a subsequent operation. The torque responsive clutch, asshown in Figures 11 and 12 of the drawings, comprises an outer shell II2 of generally cuplike construction, which shell has an axial integralhub II4 which is pinned as at II8 to the pinion shaft 54. The shell H2is provided with a slot I20 in its annular rim and is likewise providedwith an outstanding, radially extending lug I24. A torsion spring I26through which the driving takes place has one end I28 which is anchoredin the slot I20 of the shell and has an opposite inner end I 38 which isanchored as hereinafter described. The spring houses within the hollowshell II2. As shown in Figure 12, the lug I24 has a portion I25 thatextends outwardly beyond the edge or mouthof the shell II2. A disk I32is provided with a hub I34. The hub in turn is provided with a groove orslot I 36. The hub is adapted to surround the pinion shaft 54 and has abearing thereon and rotates with respect thereto. The hub extends intothe shell H2 and is housed thereby. The inner end I36 of thespringI26'is anchored in the slot I36 of the hub I34. The disk is providedwith an offset. portion I38 to receive a pivot pin I40 which pivots atrigger I42 to the disk. This trigger has an outwardly extending leg I44whichleg isbent at right angles-to provide a portion out of It will thusbe seen that the valve the plane of the trigger I42. opposite leg I48 ofthe trigger i42 projects normally outwardly beyond the periphery of thedisk I32 being normally held in this position by meansof a coil spring559- which is anchored to the outer end of the leg I44 and likewise tothe disk I32. The disk I32 is also provided with a radially outstanding,substantially square ear I52 which cooperates with the lug I25 on theshell II 2. The trigger portion -48 also cooperates with the lug I24 onthe shell I i2 during a certainpart of the driving operation. A seconddisk 454 is provided with an annular collar I55 extending from one facethereof. It is provided with an oppositely extending sleeve It]extending cen trally thereof. This sleeve IfiI is provided withdiametrically disposed slots I62 for receiving driving pins !65 formedon the inner end I64 of a short shaft. This short shaft in turn in provided with a ball-like head I61 and oppositely extending pins I69 whichengage in slots III on the end of the computer shaft 5|. ln addition,the sleeve It! is provided with a groove ISO to receive a spring H2which engages in a grooved end N4 of the driving shaft 54. The computerreset shaft 51, as is well known, is adapted to be operated in onedirection, preferably forwardly, to turn the numeral wheels to zero forthe reset operation. This forward or clockwise turning of the resetshaft is to the extent of 405 degrees forwardly to reset thenumeral'wheels and computer, and then the shaft, under spring action of.a spring in the computer itself, turns the reset shaft rearwardly 45degrees to remove the shutters from the reset numerals, as is well knownin the art. The clutch herein disclosed accomplishes this function. Thesecond disk I54 is providedwith a cam surface I58 andan abrupt shoulder.iithereon. This camsurface I and the shoulder we are adapted tocooperate withthe upturned end M4 of the trigger mechanism i lt carried:by the first disk I32. The pinion drive shaft extends through thissleeves The groove il of the shaft 54- will lie opposite the slot sothatthe spring inserted in this slot will lie in the groove W4 of theshaft 54. r

Pivoted as at I'ifi" to the inner end 96 of the switch lever 98 is aswitch rod I18, the inner end carrying a switch I80 which is adapted tomake electrical contacts with the electrical. circuit of the motor 3which drives the pump 4, ina well known manner. 7 v

By reference to Figure 3, the liquid drain pipe 58 connects to the topportionof the hydraulic cylinder 24. The opposite end of. this pipe I8connects with the float chamber I3. v

In the operation of the entiremechanism, as-

suming that due to a previous op'erationof the computing dispensing pumpthe numeralwheelshave stopped at 5 gallons and the corresponding totalcost wheels of the computer have-stopped-at $1.00, which would be thetotal cost of 5 gallons at 20c per gallon, when it is desired to makeasecond and subsequent dispensing. the operator takes the nozzle 4'7 fromthe hook and manually raises the switch lever 98-. Prior to raising thewill be completely downward because'boththe top and bottom of the pistonare at-a-tmosphericpressure when the pump is idle, thereby allowing thespring 68 to push the piston downward to the bottommost position, asshown in F-igure'g.

At this time the nozzle valve is closed and the valve I96 is closed, andthe two" valves" 2I and 22' In addition, the

are closed, as stated. The operator then removes the nozzle from itshook and raises the switch lever 98'to the "011 position of the pump, asshown in Figure 4. This immediately, through the rod I78, closes theswitch and starts the pump motor to start the pump 4. Pressure in thechamber II is immediately created. The spring of valve 2I is set forapproximately I0 pounds. The spring of the by-pass valve 22 is set for20 pounds. The spring 68 on the hydraulic piston cylinder chamber 20 isset for less than 20 pounds. The spring I58 is set for more than 22pounds. As soon as the pump is started, the rack 62- is raised and in soraising the rack will turn the pinion 69 on the shaft 54. Figure 7 ofthe draw} ings shows the position of the parts of the clutch before thepump is started. Figure 8 shows the position of. the parts after thepump has been started, and shows the reset shaft 5| turning forwardly orclockwise one and one eighth revolutions. During the turning of thereset shaft the first one eighth of a turn, the spring in the computeris energized. The turning of the reset shaft by the turning of thedriveshaft 54 is ac complished in the following way. As a result of thepressure created in the chamber II liquid will be forced through thepipe 42 into the hydraulic cylinder 29 to raise the piston 56 againstthe tension of the spring 68.- (This will force the rack upwardly andpush the plunger 18 outward- 1y so that its outer end contacts therounded periphery of the cam 96 as shown in Figure 4.) As the rack 62moves upwardly the pinion 68 isrotated torotate the shaft 54. Assoon asthe pump is started during theraising of the rack, the shell IIZ, beingconnected to the shaft 54, will be rotated in a clockwise direction.This shell [I2 is connected as at I28 with the outerend ofthe springI26, and the inner end I30 of the spring is connected to the collar I34of the disk I32 by means of the slot I36, see Figure 12. This springthen acts as a driver for rotating the disk I 32 in a forward, clockwisedirection. The'disk I32 thus rotating forwardly will carry the triggermechanism I48 in a forward, clockwise manner around with it, and sincethe toe I44 of this trigger is engaging the shoulder I10 of the diskI54, this latter disk I54 will likewise be turned in a forward,clockwise direction. It will be remembered that the spring I59 maintainsthis toe in contact with the shoulder I10. This second disk- I54, beingconnected by means of the slot I62 and" the pins I66, pins I69 and slotI'II' of the shaft5I, will turn likewise to drive the reset shaft 5Iforwardly in aclockwise direction. After one i the end I48 of thetrigger mechanism to'push the same about its pivot I in a clockwisedirection toshift the toe I44 of the trigger mechanism away from theshoulder I?!) of the disk I54, thereby to break the driving connectionbetween the driven disk I 32 and the driven disk I54. This position isindicated in Figure 9 where the toe I44 is just leaving the shoulderI'IEI. As soon as this release occurs, thedisk I 54'wi1l rotatebackwardly in a counterclockwise direction degrees to re--movetheshuttersfrom the-reset numerals This backward movement is causedby the spring in the computer mechanism itself, which spring is presentin practically all standard types of computers, such for instance as thecomputers now manufactured by Veeder-Root, Incorporated, and in use onpractically all types of computer pumps, such for instance as thosemanufactured by The Wayne Pump Company, Tokheim Oil Tank and PumpCompany, and Gilbert & Barker Manufacturing Company. The return of thisdisk I54 is shown in Figure 10. Simultaneously with the return of thisdisk I54 the toe I52 on the disk I32, still moving forwardly clockwise,contacts the lug I24 of the shell, due to the action of the spring I26.

Referring to the foregoing cycle of operations, it is to be noticed thatduring the preliminary rotation of the reset shaft 5| the first actionis to move the shutters over the numeral wheels and thereafter to shiftthe numeral wheels toward zero setting. As the rack continues to rise,the resetting will continue to the position where the upper end of therack reaches the line A in Figure 4 of the drawings. This latterposition of the rack corresponds to the completion of the resettingoperation by the computer mechanism of the computer itself andcorresponds-to a situation where a portion of the operative mechanism ofthe computer contacts the movable stop. That is, when the computer shaftcomes to the 10 line 40-43 due to the fact that the nozzle valve 41a isstill unopened. As soon as the nozzle valve 41a is opened, dispensingflow will immediately take place under the influence of the rotatingpump 4, and the Valve H16 will thus be held open by rack 62 to permitthis. Immediately upon the completion of that particular dispensingoperation the operator will then return the switch lever 93 to the downor off position to stop the pump, see Figure 5. Immediately the pressurein the chamber II drops, and this drop correspondingly reduces thepressure in the hydraulic cylinder 20. When the pressure gets lowenough, the spring 68. will start forcing the piston 66 down. This willcary the rackdown so that when the top of the rack descends to point A(see Figure 4) the valve l 66 will close under the action of the springI08. As shown in Figure 5, the rack continues to descend to recock orrecondition the reset mechanism for the next dispensing and itssubsequently following reset operation. As long as the rack is in anupward position the blunt nose of the plunger 18 will bear or slideagainst the side of the rack tmmaintain the latch 88 against the roundedside 96 of the switch 98. However, when I the switch arm is lowered,this shoulder 54 will end of its rotating reset motion, it engages astop within the computer proper. This creates excessive torque on thecomputer reset shaft which in turn moves lug IZ I away from the ear I52(Figure 9), thereby engaging the upper arm I 43 of the trigger anddisengaging the trigger from the cam I54 to break the drive between thedisk I32 and the disk I54. During the rotation of the reset shaft, thatis, during at least one eighth of the reset revolution of the computer,a torque spring in the computer is energized so that at the conclusionof the reset operation when the reset mechanism strikes the stop and thedriving connection between the disks I54 and I32 is broken,

this energized spring then comes into action so that when in positioncorresponding tothe top of the rack reaching the line A, the springreverses the reset operation one eighth of a turn, whereby to remove theshutters from the now reset counter wheels. This action takes placeafter the disengaged position is reached, just as the parts move beyondthe position shown in Figure 9, so that the tang I44 is free of theshoulder I19 and thereafter rides upon the smooth portion 1689f the camdisk i5 3. By this time, the rack has continued on up to the positionshown at B in Figure 4 where the tip of the rack strikes the shank ofthe valve I66 and opens it against the pressure of the spring I08. Thisposition is shown in Figure 4. This valve let, which constitutes, adelivery valve or a valve controlling the flow of dispensing fluid inthe delivery line, is thus held in open position as long as theresetting piston is held in its topmost position, as shown in Figure 4.At this time no dispensing occurs because the nozzle valve is not open.As the pressure in the chamber i I continues to build up, and whentwenty pounds pressure has been reached the by-pass valve 22 will opento permit the liquid to by-pass around the pump, as is well known in theart. Erior to this, to-wit, at ten pounds pressure, the valve 2| hasbeen opened by the pressure occurring against the underside of thepiston of the valve as set forth in the prior patent to Bechtold, but noflow takes place through the flow be brought above the position of thelatch so that the latch will then snap under it as shown in Figure 5,and thereafter it will be impossible to raise the switch 98 until therack 62 has moved back to its lowermost position, as shown in Figure 3,which corresponds to the completion of the recock or reconditioningposition of the reset mechanism. The reverse movement of the rack, whichbrings about a reverse rotation of the shaft 54, and hence a reverserotation of the shell H2, is permitted since the pivoted trip I48carried by the shell will revolve in an opposite direction, the tang I44thereof moving in such a direction as to pass the shoulderedportion I16of the disk I68 on the pinion shaft.

From the foregoing it will be apparent that one of the great advantagesof the present construction of hydraulic automatic reset mechanism isthat the speed of the reset mechanism can be controlled to whateverappears to be the most satisfactory speed; because the hydraulic resetmechanism provides a controlled and fixed pressure for actuating thepiston which supplies the power for the reset mechanism. The rate ofspeed of reset can be controlled by controlling the size of the pipe 42.The speed of the cocking action is controlled by the strength of spring68 and the size of the orifice I2 and size of pipe 42.

Furthermore, the present reset mechanism provides means for protectingthe operator of the pump, or the owner of the pump, against dispensingany gasolineprior to the completion of the reset due to the fact thatthe valve I 05 cannot be opened until after the computer head'has I beencompletely reset, and further in view of the fact that it is controlledby the reset mechanism itself. In fact, in the present device the powerhas been disconnected from the computer before this valve can open. Thelatter part of the stroke of the rack which has been disconnected fromthe computer goes upward some distance after the line A is reached,before it fully opens the valve I06 at the line B. By reference to thedrawings, the line A shows the point at which the reset rack 62 isdisconnected from the computer through the clutch H2. Asthe nose I2 ofthe rack 62 passesbeyond the point A it contacts the lower end of thevalve stem Ila-and begins to open the valve I06. From the point A to the11 point B the valve I06 is opening and at the point B the valve I06 issufficiently open. Hence until the rack reaves the point A, at whichtime the resetting has been completed and the rack disconnected, thevalve I06 will not be opened to permit fiow through the line I04 andthus there is provided means for preventing the liquid from flowingthrough the dispensing line until the completion of the reset operationand until the reset shaft is disconnected by means of the clutch H2 fromthe computer.

In addition, means is also provided in the form of the shoulder 96 onthe motor switch Q8 and its cooperative latch 88 for preventing theswitch from being turned to off position and then turned on againimmediately in an attempt to stop the computer in the middle of thereset operation. This means, herein shown in the form of the latch 88,prevents the motor or pump switch being turned to on position againafter once being turned to "off position, until the reset mechanism hasbeen returned to its normal position. Figure shows the position wherethe rack is descending and shows that the motor pump switch 98 is lockedin oil position until the rack 62 completely descends to the positionshown in Figure 3, which means that the operator cannot stop theresetting mechanism in the middle of a cocking cycle because if he didhe could cause the computer to show a false reading. switch lockingmechanism therefore precludes the operator from stopping the resetoperation when half-way through, so that a dispensing operation for asubsequent purchaser would not start with the dials away from zeroposition, and hence the subsequent purchaser would not be deirauded andcharged for more gasoline than he actually received. This mechanismprevents the operator from restarting the motor when the resetting rackis in a partially downward position due to the fact that the rack itselfmust go all the way down in order to permit the latch .to be pushedinwardly by a spring to escape the shoulder of the switch lever. Thismechanism will ensure that the reset mechanism when once put intooperation by the opening of the switch, and followed by the raising ofthe switch followed by the lowering of the switch to stop dispensing,must move through a full cycle before the switch can be thrown on again.

In the event that a type of computer is used wherein the reset shaftturns through two complete revolutions but has no partial backwardtravel, a simple type of overrunning clutch or a friction clutch may beused in place of the clutch H2.

In certain instances it is desirable to provide means interconnectingthe switch leverand the rack for holding the rack in full raisedposition up to the point B where the valve I05 is maintained in openposition during dispensing so as to preclude the partial lowering of therack, as when a large amount of air passes through the air releasechamber, or due to a momentary failure of the current in the line asdistinguished from an opening of the switch lever 98. Such means isillustrated in Figure 13. This mechanism comprises a wedge-shapedabutment Isa formed on the side of the rack 62 and having an upperwedge-shaped face and providing a lower shoulder. In cooperation withthis wedgeshaped abutment there is provided a second latch I86 passingthrough the desired portion of the wall 58, which second latch has ahead manormally pressed by a spring I90 and confined with- The in ahollow plunger I92 on the end of a rod I95. This rod is pivoted at I96to a bell crank lever I98 pivoted at 200 and pivotally connected as at202 by means of an arm 2.04 to the switch arm 98' by means of thepivotal connection 2%, so that when the switch arm is raised the arm I95will be pushed inwardly, tending to push against the side of the rack.When the rack is raised, and after arm 98 has been raised to pump on"position, the. upper surface of abutment its will ride past the latchI86, after which the latter will spring under the shoulder of theabutment whereby to maintain the rack in raised position until such timeas the switch lever is thrown to the off position, which immediatelywithdraws the second latch I86 so that thereafter the rack 62 is free todescend. By thus holding the rack in raised position continuously duringdispensing and until the switch lever 98 is restored to pumpoffpositiOn, a relatively large momentary volume of air passingthroughthe chamber II even though it'causes a drop in the chamber and a drop inthe pressure in the cylinder 29 will not permit the valve I06 to beclosed under the force of .the spring I08. Hence the dispensing linewill be kept open. Without this means, if the rack should drop adistancedue to the decrease of pressure in the cylinder due in turn to amomentary large volume of air passing through the chamber II, thedispensing valve would close, and then when the air had passed and thepressure picked up again, the rack would move upwardly again away fromits fallen position, and

this last raising movement of the rack would throw the shutters of thedials and partially turn the computer dials and the shutters wouldremain over the dials because the reset opera tion would not becompleted. With the last described mechanism, however, this isimpossible because the latching mechanism I86 will hold the rack in itselevated position and will hold the valve I66 open so that the rackcannot drop, and therefore will not drop and then raise again, and willtherefore not throw the shutters over the numeral wheels or cause afalse movement of the numeral wheels. The fact that the valve IE6 isheld open during the momentary movement of a large volume of air throughthe air separator, is immaterial because the valve 2| of the airseparator will close at this point and prevent any such air from gettinginto the dispensing line.

Referring now to the modification shown in Figure'lfi, only a portion ofthe structure shown in the prior figures is modified. The modifica tionrelates to the construction of the hydraulic cylinder and its rack andthe construction of the latching apparatus. In addition, a moresimplified construction of clutch is shown. Referring to Figure 15,there is shown a preferably cast cylinder base 208 in which is seatedthe cylinder 2lIl. The upper end of this cylinder is closed by means ofan elongated cylindrical cap 2E2 which at its upper end 2I4 is formed ofsmaller dimensions and terminates in a relatively long barrellikeportion 2I6, extending considerably beyond the restricted portion 2I4and connecting with a fitting 2I8 in which the valve Hi6 and its stemIII! are mounted. The hydraulic piston 220 is attached to the bottom ofthe rack 222 in any suitable manner, as my means of the centralizedscrew 224 which confines the usual type or circular gasket 226 betweenthe piston and the retaining plate 228. A coil spring 239 is confinedbetween the inner face of the piston 229 and the shoulder 94 in Figureof the drawings.

upper end of the narrowed portion 2| 4 of the cap 2|2, the narrowedportion being provided with a shoulder to retain the upper end of thespring.

Mounted in the cap 2 I4 is the pinion shaft 232 on which is mounted thepinion 234. This pinion shaft 232 corresponds with the pinion shaft 54of Figure 3, and the pinion 234 corresponds with the pinion 69 of Figure3. This pinion 234 meshes with the teeth 236 of the rack 222. Inaddition, the upper end of the rack is provided with a narrowed. end 231and an inclined shoulder 249, much like the upper end portion 12 of therack 62 is formed in Figure 3. The top of the rack operates andreciprocates in the relatively small sleeve-like portion 2I6 and itsupper portion is arranged to contact the lower end of the valve stemIII) in the same way that the rack 62 contacts the valve stem H9 inFigure 3. So also the fitting or cap 2 I4 is provided with an enlarged,inwardly projecting wall portion 242 which is recessed as at 244 toreceive a bushing 246. The bushing 246 forms a bearing for a head 248.The head 248 has a threaded internal bore to which is also threaded asleeve 250 which has an outer bearing in a flanged ring 252 that isbolted as at 254 and 256 to the outer wall of the head 2| 4. Themember'250 has a central opening through which reciprocates a latch pin258 which has a rounded end 260. The other end of the latch pin 258 hasa head 252 between which and the inner end of a bore 264 of the firsthead 248 is located a coil spring 266 which spring tends to force thehead 262 of the latch pin 258 normally outwardly. In addition to themovement of the latch pin 258, the latch head 248 also has a movement inand out, toward and away from the line of reciprocation of the rack 222.To accomplish this, the head 248 is provided with an annular shoulder268 which forms a seat against which a second coil springs 219 isconfined. The opposite end of the coil spring is confined against theinner wall of the flange 252. Thus the spring 216 tends to normallyforce the head 248 inwardly against the rack bar while permitting thehead to be moved outwardly by the inclined wall 249 of the rack bar. Aspring finger 212 is mounted as at 214 on the cap 2M and has its innerends pressing against the adjacent wall of the rack 222 whereby normallyto keep the teeth of the rack resiliently in contact with the teeth ofthe pinion I Cooperating with the outer rounded end 269 of the roundedlatch 253 is a second latch member 216. This latch is of sector-likeconformation and is rigidly mounted on the shaft 218 which is adapted toturn. This shaft 218 corresponds to the shaft I09 on which the switchlever 98 is rigidly mounted so that when the lever is turned the shaftis likewise turned. Hence, when the hose nozzle is placed on the switch98, as shown more particularly in Figure 5 of the drawings,

the lever 98 will be moved to a motor off or disconnected position,whereas when the switch lever 98 is raised, the motor will be placed inoperative or motor on position. The switch latch 216 is provided with adepressed portion 289 which corresponds with the lower point of the cam96 which is shown directly below the The other portion 282 of the latchis provided with a flat or higher surface so that as the latch sector216 moves angularly with the shaft 218 either the low portion 289 or thehigher portion 292 of the latch confronts the rounded end 26s of thelatch pin 258. The action of this mechanism is other wise exactly likethe action of the latch construction shown in Figures 1 to 5.

The modified clutch arrangement is shown particularly in Figures l4, l6and 11. In Figure 17 the shaft 54 is shown at 284 as being rigidlyconnected to a collar 286 which in turn is rigidly welded or fixed to ashell-like housing 285. This housing has a punched-in ear 296 to whichone end of a coil spring 292 is connected. In addition, the inner end294 of the shaft 54 is loosely mounted in a hub 296 which is providedwith an integral cam 298 and an outwardly extending driving shaft 399provided with a slotted end 362 for engaging a universal connection withthe computer reset shaft 5|, as is shown in the prior Figures 11 and 12.The housing 288 is provided with a rivet pin 394 which pivotallysupports a latching dog 306 disposed within the housing. This latchingdog carries at its outer end an anti-friction roller 358 and is providedat its outer end with a tongue or ear 3| 9 to which is attached theopposite end 3 I2 of the coil spring 292 heretofore referred to. Inaddition, the cam 298 is provided with a cam surface 3l4 whichterminates in a shoulder 3! 6 which is adjacent a low point 3MB of thecam surface, the low point of the cam surface gradually increasing inthe manner shown, up to the high point adjacent the shoulder 3I6. In theoperation of this device, when the rack operated shaft 54 or 232 ofFigure 15 is turned, upon actuation of the rack in an upward direction,as seen in Figure 15, the pinion will be turned counterclockwise asviewed in Figure 15, which in turn moves the housing 288counterclockwise and through the pin 3G4 and the spring 292 causes theroller 398 to engage the shoulder 13"; of the cam, and the cam 298 willbe turned counterclockwise in the same direction. This counterclockwisemovement through this clutch mechanism will thus turn the shaft 399counterclockwise to cause the reset shaft 5! to move in the samedirection to cause the resetting of the computer. When the computermechanism has reached its positive stop, as hereinbefore explained, inconnection with Figures 1 to 5 inelusive and Figures 7 to 12 inclusive,the resistance set up will cause the roller 368 to disengage and moveoutwardly from the shoulder 3 I 5 thereby breaking or unclutching thedriving connection which will permit the reset shaft to continue to turnwhile the computer has stopped. This breaking of the clutch connectionpermits the rack 222 to continue to move upwardly after the resettinghas been completed so as to contact the lower end of the valve stem Hi!to open the valve I96.

Obviously the invention is not limited to the specific details ofconstruction disclosed herein but is capable of other modifications andchanges without departing from the spirit and scope of the appendedclaims.

Having thus described the invention, what is claimed as new and desiredto be secured by Letters Patent is:

l. A liquid dispensing apparatus comprising a dispensing line adapted tobe connected to a source of liquid supply, means for controlling thefiow of liquid through the dispensing line, register mechanism operablein accordance with the flow of liquid through the-dispensing line,resetting means for the register mechanism, control means for efiectingthe operation of the register resetting means and the liquid flowcontrol means, said control means including mechanism for operating theflow control means in predetermined timed relation to the operation ofthe register resetting means and including mechanism operable upon theactuation of the control means for efiecting the operation of the liquidflow control means'to cause the pressure of the liquid in the dispensingline to cause the complete automatic cyclic operation of the resettingmeans before the control means can be reoperated to cause a subsequentoperation of the liquid flow control means.

,2. A liquid dispensing apparatus comprising a dispensing line adaptedto be connected to a source of liquid supply, pumping means for forcingliquid through the dispensing line, means including a delivery valve forcontrolling the flow of liquid through the dispensing line, registermechanism operable in accordance with the flow of liquid through thedispensing line, resetting means for th registering mechanism, andcontrol means for effecting the operation of the pumping means, theoperation of the register resetting means, and the operation of thedelivery valve, said control means including mechanism operable bypressure of liquid in the dispensing line for effecting the opening ofthe delivery valve at a predetermined time interval after the operationof the resetting means and for ensuring the completion of the operationof the resetting means prior to a subsequent operation of the pumpoperating means by said control means.

3. A liquid dispensing apparatus comprising a dispensing line adapted tobe connected to a source of liquid supply, pumping means for forcingliquid through said dispensing line including a manually operableswitch, means including a delivery valve in the dispensing line forcontrolling the flow of liquid through the dispensing line, saidmanually operable switch controlling said pumping means, registermechanism operable in accordance with the flow of liquid through thedispensing line, resetting means for the register mechanism, and commoncontrol means for effecting the operation of the register resettingmeans, and said delivery valve including mechanism operable by pressureof liquid in the dispensing line for efiecting the opening of thedelivery valve a predetermined time interval after the operation of theregister resetting means and for preventing a subsequent operation ofthe manually controlled switch until the completion of the operation ofthe resetting means.

i. A liquid dispensing apparatus comprising a dispensing line adapted tobe connected to a source of liquid supply, pumping means for pumpingliquid through said dispensing line, a motor for driving the pump and aswitch operating mechanism for operating the motor, register mechanismoperable in accordance with the flow of liquid through the dispensingline, resetting means for the registering mechanism, and control meansinterconnecting the switch operating mechanism and the resettingmechanism and actuated by pressure of liquid in the dispensing line forpreventing the operation of the switch operating mechanism to restartthe motor until the resetting mechanism has completed its cycle ofoperation.

5. A liquid dispensing apparatus comprising a dispensing line adapted tobe connected to a source of liquid supply, means including a deliveryvalve for controlling the flow of liquid through the dispensing line,register mechanism operable in accordance with the flow of liquidthrough the dispensing line, resetting means for the register mechanism,a pump for forcing liquid through said dispensing line, a motor for thepump, a manually operated switch lever for the motor, an actuatablemember adapted to move a predetermined distance upon the operation ofthe pump by said motor, means operated by the movement of said memberfor actuating the resetting mechanism and for subsequently opening thedelivery valve, and means cooperating with the travel of said member andassociated with the switch lever for preventing two consecutiveoperations of said switch lever unless the resetting mechanism has beencompletely operated by a predetermined movement of said member.

6. A liquid dispensing apparatus comprising a liquid dispensing lineadapted to be connected to a source of liquid supply, a pump in saidline.

a motor for driving the pump, a manually operated switch member foractuating said motor, means including a delivery valve for controllingthe flow of liquid through the dispensing line, register mechanismoperable in accordance with the flow of liquid through the dispensingline, a cylinder, a piston in the cylinder, connections from saidcylinder to the liquid flow line to cause the operation of said pistonupon the creation of a pressure in the flow line, a rack operated by thepiston, means actuated by movement of the rack for operating theresetting mechanism, said rack upon a predetermined movement actuatingsaid delivery valve, and a latchin device disposed in the path ofmovement of said rack cooperating with the switch operating mechanism ofthe motor for preventing two consecutive movements of the switchoperating mechanism to pump operating position unless the resettingmechanism has completed its resetting travel.

'7. A liquid dispensing apparatus comprising a dispensing line adaptedto be connected to a source of liquid supply, means including a deliveryvalve ior controlling the flow of liquid through the dispensing line,register mechanism operable in accordance with the fiow of liquidthrough the dispensing line, resetting means for the register mechanism,a pump for forcing liquid through said dispensing line, a motor for thepump, manually operated switch mechanism for the motor, and controlmeans operable upon the movement of said pump means for effecting theoperation of the register resetting means and the delivery valve, saidcontrol means including mechanism for efiecting the opening of thedelivery valve a predetermined time after the operation of the registerresetting means and including mechanism for locking the manuallyoperated switch means for subsequent operation until after thecompletion of the resetting of the rack.

8. A liquid dispensing apparatus comprising a dispensing line adapted tobe comnected to a source of liquid supply, a pump for forcing liquidthrough the line, a motor for the pump and a manually operated switchmember for controlling the pump motor, means including a delivery valvein the dispensing line for controlling the flow of liquid through saidline, register mechanism operable in accordance with the flow of liquidthrough said line, resetting means for the register mechanism and meansactuated by the movement of said switch member for operating theregister resetting means and said delivery valve, said means includingmechanism for efiecting the opening of the delivery valve apredetermined time after the operation of the resetting means andincluding mechanism for maintaining the delivery valve in 17 openposition until said pump switch operating member is thrown to such aposition that th pump motor is rendered inoperative.

9. A liquid dispensing apparatus comprising a dispensing line adapted tobe connected to a source of liquid supply, a pump for forcing liquidthrough the line, a motor for the pump and a manually operated switchmember for controlling the pump motor, means including a delivery valvein the dispensing line for controlling the flow of liquid through saidline, register mechanism operable in accordance with the flow of liquidthrough said line, resetting means for the register mechanism and meansactuated by the movement of said switch member for operating theregister resetting means and said delivery valve, said means includingmechanism for effecting the opening of the delivery valve apredetermined time after the operation of the resetting means andincluding mechanism for preventing momentary closure of the deliveryvalve under momentary failure in the current in the line asdistinguishing from the throwing of the pump motor switch to pump offposition.

10. A liquid dispensing apparatus comprising a dispensing line adaptedto be connected to a source of liquid supply, means including a deliveryvalve for controlling the flow of liquid through said dispensing line,register mechanism operable in accordance with the flow of liquidthrough the dispensing line, reset mechanism for the register mechanism,air release mechanism for said dispensing line including a pressurechamber subject to a relatively low pressure when the pump is idle andsubject to substantial pressure when the pump is in operation, anhydraulic cylinder and liquid conduit connecting said pressure chamberwith said hydraulic cylinder, a piston in said cylinder, and meansactuated by movement of said piston for operating said reset mechanismand for opening said delivery valve, said mechanism efiecting theopening of the delivery valve a predetermined time after the operationof the register resetting means, and means for holding said deliveryvalve in open opsition during momentary movement of "large volumes ofair through the air separator.

11. A liquid dispensing apparatus comprising a dispensing line adaptedto be connected to a source of liquid supply, means including a deliveryvalve for controlling the flow of liquid through said dispensing line,register mechanism operable in accordance with the flow of liquidthrough the dispensing line, reset mechanism for the register mechanism,air release mechanism for said dispensing line including a pressurechamber subject to a relatively low pressure when the pump is inoperation, an hydraulic cylinder and liquid conduit connecting saidpressure chamber with said hydraulic cylinder, a piston in saidcylinder, and means actuated by movement of said piston for operatingsaid reset mechanism and for opening said delivery valve, said mechanismefiecting the opening of the delivery valve a predetermined time afterthe operation of the register resetting means, and means for holdingsaid delivery valve in open position during momentary movement of largevolumes of air through the air separator, a pump for forcing liquidthrough the dispensing line, a motor for driving the pump, a switchoperating member for the motor and means interconnecting the switchoperating mechanism and said movable member operated and moved by saidpiston for holding said delivery valve in open position while saidswitch operating member is in pump on" position and during the momentarymovement of large volumes of air through the air separator.

12. A liquid dispensing apparatus comprising a dispensing line adaptedto be connected to a source of liquid supply, means including a deliveryvalve for controlling the flow of liquid through said dispensing line,register mechanism operable in accordance with the flow of liquidthrough the dispensing line, reset mechanism for the register mechanism,air release mechanism for said dispensing line including a pressurechamber subject to a relatively low pressure when the pump is inoperation, an hydraulic cylinder and liquid conduit connecting saidpressure chamber with said hydraulic cylinder, a piston in saidcylinder, and means actuated by movement of said piston for operatingsaid reset mechanism and for opening said delivery valve, said mechanismeffecting the opening of the delivery valve a predetermined time afterthe operation of the register resetting means, means for holding saiddelivery valve in open position during momentary movement of largevolumes of air through the air separator, a pump'for forcing liquidthrough the dispensing line, a motor for driving the pump, a switchoperating member for the motor and means interconnecting the switchoperating mechanism and said movable member operated and moved by saidpiston for holding said delivery valve in open position while saidswitch operating member is in pump on position and during the momentarymovement of large volumes of air through the air separator, and meansfor locking said pump switch operating member from subsequent pumpoperating movement until the completeion of the reset operation.

13. In a liquid dispensing apparatus comprising a dispensing lineadapted to be connected to a source of liquid supply,.means including adelivery valve in said line for controlling the flow of liquidtherethrough, registering means operable in accordance with the flow ofliquid through said dispensing line, said registering mechanismincluding shutter mechanism operable to cover the computing indicia,said computing mechanism being of the type requiring a manual one andone eighth forward turn to complete the resetting operation thereof andfollowed by a one eighth turn in the reverse direction for the purposeof raising the shutters masking the numeral wheels at the termination ofthe forward one and ne ei hth turn, said computing mechanism includingstop mechanism precluding further forward turning of said computingmechanism after the reset has been accomplished, said resetting meansfor the register including a reset shaft, a driving shaft for operatingsaid reset shaft, means for actuating said driving shaft in a directionto cause the reset shaft to move one and one eighth turns to effect theresetting thereof and to cause the resetting mechanism to contact thestop and thus to prevent further continued movement'of said resettingmechanism, and clutch mechanism inserted between the driving shaft andthe reset shaft including a driving element connected to said secondshaft, a spring connected to the driving element, a driven elementhaving the spring connected thereto whereby said driven element isrotated by means of said spring upon the rotation of said drivingelement, said driven element in cluding a pivoted trigger, a seconddriven element connected with the reset shaft for rotation triggerelement having a toe adapted drivingly to engage said shoulder wherebyupon movement of said driving and first driven element in one directionsaid toe engaging said shoulder will drive said second driven element inthe same direction, and means brought into operation when said resetmechanism contacts the stop in the computer mechanism for breaking theconnection between the driving element and said second driven elementwhereby the spring of the computer turns said second driven elementreversely one eighth of a revolution, and means on said firstdrivenelement and on said driving element for reconditioning said driving anddriven elements for a subsequent operation.

14. In a liquid dispensing apparatus, comprising a dispensing lineadapted to be connected to a source of liquid supply, means including adelivery valve in said line for controlling the flow of liquidtherethrough, registering means operable in accordance with the flow ofliquid through said dispensing line, said registering mechanismincluding shutter mechanism operable to cover the computing indicia,said computing mechanism being of the type requiring a manual one andone eighth forward turn to complete the resetting operation thereof andfollowed by a one eighth turn in the reverse direction for the purposeof raising the shutters and masking the numeral wheels at thetermination of the forward one and one eighth turn, and including a stopmechanism precluding further forward turning of said computing mechanismafter the reset has been accomplished, said resetting means for theregister including a reset shaft, a driving shaft for operating saidreset shaft, means for actuating said driving shaft in a direction tocause the reset shaft to move one and one eighth turns to effect theresetting thereof and to cause the resetting mechanism to stop toprevent further continued movement of said resetting mechanism, and aclutch mechanism inserted between the driving shaft and the reset shaftincluding a driving element connected to said driving shaft, aspringhaving one end connected to the same, a driven element having the otherend of the spring connected thereto whereby said driven element isrotated by means of said spring upon the rotation of said driving shaft,said driven element having thereon a pivoted trigger, said clutchmechanism including a second driven element connected with the resetshaft for rotation therewith, said second driven element having acamthereon, said cam having a shoulder, said trigger element having aportion adapted drivingly to engage said shoulder whereby upon movementof said driving and first driven element in'one direction said toeengaging said shoulder will drive said driven element in the samedirection, and means operable when said reset mechanism is stopped forbreaking the connection between the driving element and said seconddriven element whereby to permit the spring of the computer to turn saidsecond driven element reversely one eighth of a revolution, means onsaid first driven element and on said driving element for reconditiom'ngsaid driving and driven elements for a subsequent operation, said meansincluding aradially disposed lug on said first drivenelement and aspaced lug on said driving element.

15. A clutch for interconnecting a drivingshaft and a reset shaft of acomputer of the type having a reset shaft inoperable when the computeris being driven and wherein said shaft is turned 405, degrees in onedirection to reset the computer and is thereafter stopped, and whereinsaid reset shaft then rotates reversely 45 degrees, said clutchcomprising a driving shaft, a shell driven thereby, a spring connectedto the shell, a driving disk associated with said shell, the other endof the spring being connected with said driving disk whereby saiddrivingdisk is rotated by rotation of said shell, a trigger mechanism pivotallymounted on said driving disk, said trigger mechanism having an outwardlyextending lug and a laterally bent toe, said clutch including anadditional driven disk connected to said reset shaft, said disks andsaid shell having a common central axis concentrically mounted withrespect to the axis of said driving shaft and said reset shaft, saidsecond disk having a surface adapted to be engaged by said triggermechanism to form a driving engagement between said first disk and saiddriven disk, whereby upon rotation of said driving shaft said seconddriven disk is rotated.

by said first disk through the agency of said trigger, and whereby whensaid reset shaft stops said toe of said trigger will be disengaged fromthe surface of said cam to break the driving connection and permit thespring in said computer to reversely rotate the driven disk 45 degrees,said shell having means adapted to engage the radially disposed lug onsaid trigger and said driven disk having a radially disposed lug adaptedto'engage the peripherally disposed lug on said shell;

16. A clutch for interconnecting a driving shaft and a reset shaft of acomputer of the type having a reset shaft inoperable when the computeris being driven and wherein said shaft is turned 405 degrees in onedirection to reset the computer and then stops and wherein said resetshaft then rotates reversely 45 degrees, said driving shaft and resetshaft being disposed in alignment and said clutch concentricallysurrounding the axis of rotation of said shafts, and said clutchincluding a drivingmember and a driven member and a springinterconnecting said driving and driven members, and said clutchincluding an additional driven member and a disconnectable driving meansbetween said first driven member and said additional driven member andoperable when said reset mechanism of the computer stops automaticallyto render inoperative the driving means between said first drivingmember and said driven member upon the completion of the resettingoperation and thereby to permit said reset shaft to be reversely rotated45 degrees by the spring mechanism in the computer.

17. A liquid dispensing apparatus comprising a liquid dispensing lineadapted to be connected to a source of liquid supply, a pump in saidline, a motor for driving the pump, a manually operated switch memberfor actuating the motor, means including a delivery valve controllingthe flow of liquid through the dispensing line, register mechanismoperable in accordance with the flow of liquid through the dispensingline, an hydraulic cylinder, a piston in the cylinder, connections fromsaid cylinder to the flow line to cause the operation of said pistonupon the creation of a pressure in the flow line, mechanism movablyoperated by the piston, means actuated by movement of said mechanism foroperating the resetting mechanism, said mechanism upon a predeterminedmovement actuating said delivery valve, and latching means, disposed inthe path of movement, of said mechanism and cooperating With the switchoperating mechanism of the motor for preventing two consecutivemovements of the switch operating mechanism to pump operating positionunless the resetting mechanism has completed its full resetting travel.

18. A liquid dispensing apparatus comprising a dispensing line adaptedto be connected to a source of liquid supply, register mechanismoperable in accordance with the flow of liquid through the dispensingline, resetting means for the register mechanism, means responsive tothe pressure of the fluid in said dispensing line for operating saidresetting means, control means for effecting the operation of theregister resetting means, said control means including mechanism tocause the complete automatic cyclic operation of the resetting meansbefore said control means can be actuated again.

19. A fluid dispensing apparatus comprising a dispensing line adapted tobe connected to a source of liquid supply, means for controlling theflow of liquid through the dispensing line, register mechanism operablein accordance with the flow of fluid through the dispensing line,resetting means for the register mechanism, means responsive to thepressure of the fluid in said dispensing line for operating saidresetting means, control means for effecting-the operation of theregister resetting means, said control means including mechanism foroperating the flow control means in predetermined timed relation to theoperation of the resetting means, and means operable upon the actuationof said control means to cause the complete automatic cyclic operationof said resetting means before the control means can be operated again.

20. A liquid dispensing apparatus comprising a dispensing line adaptedto be connected to a source of liquid supply, pump means for forcingliquid through said line, switch means for controlling said pump means,a register mechanism operable in accordance with the flow of liquidthrough said line, resetting means for said register mechanism, meansresponsive to the pressure of the fluid in said dispensing line foroperating said resetting means, control means for effecting theoperation of said switch means and said resetting means, and means forholding said resetting means at the position occupied at the end of theresetting stroke until said control means is actuated again.

21. A liquid dispensing apparatus comprising a dispensing line adaptedto be connected to a source of liquid supply, pump means for forcingliquid through said line, switch means for controlling said pump means,a register mechanism operable in accordance with the flow of liquidthrough said line, resetting means for said register mechanism, meansresponsive to the pressure of the fluid in said dispensing line foroperating said resetting means, control means for efiecting theoperation of said switch means and said resetting means, and means forholding said resetting means at the position occupied at the terminationof the resetting operation until said control means is thrown to such aposition that the pumping means is rendered inoperative.

22. A liquid dispensing apparatus comprising a dispensing line adaptedto be connected to a source of liquid supply, pump means for forcingliquid through said line, switch means for controlling said pump means,a register mechanism operable in accordance with the flow of liquidthrough said line, resetting means for said register mechanism, meansresponsive to the pressure of the fluid in said dispensing line foroperating said resetting means, control means for effecting theoperation of said switch means and said resetting means, means forholding said resetting means at the position occupied at the end of theresetting operation, and linkage means interconnecting said holdingmeans and said control means effective to release said resetting meansfrom said holding means when the control means is thrown to such aposition that the pumping means is rendered'inoperative.

23. Aliquid dispensing apparatus comprising a dispensing line adapted tobe connected to a source of liquid supply, pumping means for forcingliquid through said line, switch means for controlling said pumpingmeans, a register mechanism operable in accordance with the flow offluid through said line, a resetting means for said register mechanism,means responsive to the pressure of the fluid in said dispensing linefor operating said resetting means, control means for effecting theoperation of said switch means and said resetting means, said controlmeans including mechanism to cause the complete automatic cyclicoperation of the resetting means before said control means can beoperated again, and means for holding said resetting means in theposition occupied after-the completion of the resetting operation untilsaid control means is thrown to such a position that the pumping meansis rendered inoperative.

24. A clutch for interconnecting a driving shaft and a reset shaft of acomputer of the type having a reset shaft inoperable when the computeris being driven and wherein said shaft is turned 405 in one direction toreset the computer and then stops and wherein said reset shaft thenrotates reversely 45, said driving shaft and reset shaft being disposedin alignment and said clutch concentrically surrounding the axis ofrotation of said shafts, said clutch including a driving member attachedto said driving shaft and a latch means pivotally mounted on saiddriving member, a driven member having a cam surface with a recessedportion formed thereon, said latch means having an anti-friction membermounted thereon, said anti-friction member being urged against said camsurface and into said recessed portion by a spring interconnecting saidlatch means and said driving member whereby to interconnect said drivingmember and said driven member during the reset operation and operablewhen said reset mechanism of the computer stops automatically to renderinoperative the driving connection between said driving member and saiddriven member upon completion of the resetting operation and whereby topermit said reset shaft to be reversely rotated 45 by the springmechanism in the computer.

25. A liquid dispensing apparatus comprising a dispensing line adaptedto be connected to a source of liquid supply, a valve means forcontrolling the flow of liquid through the dispensing line, registermechanism operable in accordance with the flow of liquid through thedispensing line, resetting means for the register mechanism, automaticcontrol means for operating said resetting means and opening said valvemeans, and hydraulic means operated by the pressure of the liquid in thedispensing line for actuating said automatic control means, said controlmeans completing the resetting of said register mechanism before openingsaid valve means whereby to insure that all liquid passing through thedispensing line is registered on the register mechanism.

A iqui di nsin app ra s comprising a dispensing line adapted: to.beconnected to a source of liquid supply, pumpingmeansfor-forcing liquidthrough ,thezdispensing line, -valve means for controlling the flowof-Jiquid-throu'gh the dispensing line, register mechanism operable inaccordance With-the flow otliqnid through the dispensing line,resetting: means-for the register mechanismswitch means forefiectingthe. operation of the pumping-means,.actuatingfmeans for saidresetting means and said valve'means, and hydraulic means operated by.theliquidi-pressure in said dispensing line for operating saidactuatingmeans, said actuating'means completing the resetting of theregister-.mechanism-before opening said valve meansiwhereby to insurethat all liquid passing through said" dispensing line is registered onsaid register mechanism.

127. A liquid. dispensing apparatus comprisinga dispensing lineadapted-tobe. connected-to; a

source of liquid supply, valve-means for controlling the flow orliquidthrough the dispensing line, register mechanism operablein-accordance .with

the flow-of liquidthrough the dispensing line, re-

2 8. .A-liquid dispensing apparatus comprising a dispensing, lineadapted to be connected .to a source'ofliquid supply, valve-means forcontrolling the flow of liquid through said dispensing line, pump; meansfor forcing liquid through said dispensing line, switch means forcontrollingsaid pump 'means, a register mechanism operable in accordancewith the flow of liquid through said dispensing-line, resettingmeans forsaid register nechanism means responsive to the pressure of the fluid.in said dispensing line foroperating said resetting. means-and openingsaid valve means,

.said last mentioned means opening said valve means onlyafter saidresetting means hascompleted the-resetting operation, control means for.efiecting the operation of said switch means, and

means for holding said resetting means at the position occupied at theend of the resetting .stroke-untilsaid control means is actuated.

ROBERT HILL. BURDETTE -W. FOSS.

IREFEBENCES CITED iTherfollowing references are of record 'inthe :fiieofthis patent:

UNITED STATES PATENTS .Number Name Date 2,022,932 De Lancey Dec. 3,.1935 2,072,522. Lent Mar. 2, 1937 2,2 6' 7,793 Hayard Dec. .30, 19.41

